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Table 2 Factors associated with the increase in TFI score in permanent teeth after 3 years

From: Clinical changes in the severity of dental fluorosis: a longitudinal evaluation

Baseline variable Incidence Crude Adjusted
RR 95%IC   p-value RR IC95%   p-value
Sex          
Male 27.1 1.3 0.8 1.9 0.308 1.4 0.9 2.1 0.093
Female 21.6 1.0     1.0    
Age          
8 30.3 1.4 0.7 2.7 0.379 1.6 0.8 3.3 0.165
9 35.3 1.6 0.8 3.0 0.163 1.8 1.0 3.5 0.064
10 37.7 1.7 0.9 3.2 0.106 1.8 1.0 3.4 0.066
11 38.5 1.7 0.9 3.3 0.089 1.7 0.9 3.3 0.082
12 22.2 1.0     1.0    
Baseline TFI          
TF 1 44.2 7.3 1.3 40.1 0.022 9.7 1.7 56.5 0.011
TF 2 12.7 2.1 0.4 11.6 0.394 2.8 0.5 16.5 0.251
TF 3 12.1 2.0 0.5 8.1 0.334 1.9 0.4 8.3 0.397
TF 5 6.1 1.0     1.0    
Tooth type          
Incisors-primer molar 20.0 1.8 1.0 3.3 0.054 1.1 0.8 1.4 0.678
Canines-premolar-second molar 33.2 3.0 1.7 5.2 0.000 1.5 1.1 2.0 0.005
Maxillary incisors 11.2 1.0     1.0